Learning that is relevant. Not to us as teachers, but to the individual student. At HSRA it was based on the individual student passions. For our students and others in many project based learning programs, the project is focused around a theme in which content would work as the framework, but the product and whatever else is needed to reach that product is student choice, and they own it. It gives them not only a chance to find a passion, but more importantly to expand their horizons and give them a chance to reach outside of their comfort zones.